METHOD FOR OVERALL REGULATION OF THE HEADBOX AND/OR THE FORMER OF A PAPER MACHINE OR EQUIVALENT

摘要

A method for continuous overall regulation of the headbox/former of a paper or board machine or equivalent. In the method a physical fluid flow model of the drainage and of the flow state of the pulp suspension flow is formed for the headbox (100)/former (100') to be regulated. The model is solved by making use of the data on the geometry of the headbox (100)/former (100') and of the initial and boundary conditions necessary for a solution of the model. The difference between the simulated state, which has been obtained as the solution of said model, and the state adopted as the target is determined as the cost function, wherein the target state is determined by means of the quality requirements of the paper and possibly by means of the costs of operation and the runnability of the paper machine. The cost function is optimized and, thus optimal regulation values and set values (C) are sought for the instrumentation devices and actuators (105) of the headbox (100)/former (100') in view of the given cost function. After the optimization has been carried out in the preceding stage, the headbox (100)/former (100') regulation devices are given new optimal regulation and set values (C).